

Increasing of effectiveness of complicated technical
system

Object 
Problem 
The achieved result 

Gasturbine engine

The improving of engine's fan effectiveness  The increasing in the fan efficiency up to 3% was achieved by optimal profiling of its blades vanes and passage, which allowed to have the optimal distribution of compression work between the stages and by the radius. Dimensionality  up to 63.  
The improving of engine's fuel economy at throttled operating modes  The optimal control laws of engine's passage controllable elements were obtained, which allowed to decrease the specific fuel consumption at throttled operating modes up to 8% due to optimal coordination of engine's functional elements work. Dimensionality  up to 14.  
The decreasing of engine's acceleration time  The optimal time control laws of passage controllable elements were achieved, which allowed to decrease the acceleration time 1.5 times as less due to optimal coordination of all control efforts during transitional process. Dimensionality  20.  
Multistage axial flow compressor for engine with high bypass ratio

The improving of the high pressure compressor effectiveness  The high pressure compressor efficiency was increased by 1.5% due to its optimal profiling. The rise of effectiveness was reached due to optimal coordination of gasdynamic parameters of work of elementary vanes in a system of the compressor. Dimensionality  up to 96.  
The improving of middle pressure compressor effectiveness  The middle pressure compressor efficiency was increased by 1.7% due to optimal control laws of its stator blades. The optimal structure of compressor's stator blades control was determined. The rise in effectiveness was provided by optimal distribution of compression work between compressor's stages. Dimensionality  5.  
Heat machine 
Remaking of aircraft engine without operational resource in heat machine with minimal modifications  The fuel economy of heat machine was improved by more then 10%. Optimal coordination of components of engines without operational resource was carried out for their operation in a complex of heat machine.  
The technological process  Improving of metal structures welding technologies  Just in industrial process due to optimal coordination of 13 technological parameters the improving of strength indicators of metal structures welded joint by 14% was achieved.  
Gasturbine engine with high bypass ratio 
The increasing of engine's fan effectiveness at engine's takeoff and cruising operating modes simultaneously  The means was proposed to increase fan's rotor efficiency by 2.5% for engine's takeoff operating mode and by 2% for its cruising operating mode by means of optimal profiling of fan's rotor blades. The advantage in effectiveness was reached due to optimal distribution of rotor blades work by the radius. Dimensionality19.  
Military aircraft  Improving of aircraft maneuverability  Optimal control laws of power plant controllable elements and of the aircraft were determined, which allowed to reduce the time of aerobatics maneuvers making by 510%. The dimensionality of optimization problems  up to 70 variables.  
automobile engine  Insurance of best fuel economy under securing of required level of exhaust toxicity (NOx, COetc.).  Engine's fuel economy was improved by up to 6%. Optimal calibration of electronic fuel supply and ignition control system was carried out. Dimensionality  up to 6.  
Multilayer optical coverings 
Insurance of minimal values of reflection (adsorption) ratios of the surface in given range of wave lengths.  Optimal values of surface multilayer optical covering layer thickness were determined, which assured the considerable reducing of reflection ratio on given range of wave length. The dimensionality of optimization problems  up to 96 variables.  
STOVL aircraft power plant 
Improving of aircraft takeoff performance for its short takeoff  There were determined optimal time control laws of 7 controllable elements of power plant passage, of angles of nozzles setting and aircraft pitch, which allowed to reduce the length of takeoff run by 2.5 times comparing with ordinary power plant control. Dimensionality  49 variables.  
Allwheels driven car transmission 
Increasing of wearresistance and durability of automobile transmission parts.  Optimal values of car transmis sion 38 structurearrangement parameters were determined, insuring improving of 5 effecti veness indicators by 6 to 85%.  
Multistage axial flow compressor 
The increasing of the compressor efficiency for the designpoint operating mode.  The solution was obtained, which improved the compressor efficiency up to 4% for the designpoint operating mode. The optimal profiling of the compressor blade rows was performed, which allowed to redistribute optimally the work of stages. Dimensionality  140.  
The search of a compromise between the compressor efficiency and stall margin.  4 nonimprovable (Pareto optimal) solutions were found, ensuring the compromise between the compressor efficiency and stall margin for the designpoint operating mode. Dimensionality  140.  
The increasing of the compressor efficiency for the offdesign operating modes.  The optimal control laws of the compressor stator blades were found, which allowed to improve the compressor efficiency up to 2.4% for the offdesign operating modes.  
The increasing of the probability of the compressor design parameters practical implementation.  The optimal profiling of the compressor blade rows was performed taking into account their manufacturing accuracy. For the first time the multicriteria stochastic optimization problem has been solved with the dimensionality of 140 variables and 3 criteria. There was obtained the set of Pareto optimal solutions by the criteria: the efficiency, the probability of constraints keeping, the effectiveness parameters spread. 

© Sigma Technology 2001, 2009. 